JPS601581A - battery tester - Google Patents

Abstract

PURPOSE:To achieve a smaller size and a lighter weight of a battery tester while enabling the miniaturization of a clip used by setting a storage battery for electric equipment of a vehicle as load to be compared with the reference voltage for judgement. CONSTITUTION:When a clip input terminal 20' is connected to a terminal 7 of a vehicle 1, a holding circuit 14 of a battery tester 8 is reset with a resetting circuit 16. Under such a condition, as soon as an operation switch 3 or a lighting circuit switch 4 is turned ON, a storage battery 6 is set through electric equipment of the vehicle such as a starter 2 or a stop lamp 5. The terminal voltage Vb associated with the setting of the battery is compared with the reference voltage Va for judgement to be selected with a judging reference voltage generation circuit 13 according to the type of vehicles and batteries and the like by a comparator circuit 12. When the voltage Vb falls below the voltage Va, the lowering of the life of the battery 6 is judged and the judgement results are retained in a circuit 14 for display or the like. Depending on the resistance of this battery tester, the need is eliminated for large current setting of the storage battery thereby achieving a small size and a lighter weight of the battery tester while enabling miniaturization of a clip used.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a battery tester for determining the discharge state and life of a storage battery mounted on an automobile.

As shown in FIG. 1, in the conventional battery tester, a storage battery 6 is connected to a battery tester 8, a large current is discharged through a built-in resistor 10, etc., and the terminal voltage of the storage battery 6 after being discharged for a predetermined time is determined by a determination circuit 11. The determination was made by comparing it with a reference voltage.

For this purpose, the battery tester 8 must be equipped with a discharging resistor 10 that can handle a large amount of power, and the connection wire 19 and connection 1) between the battery tester 8 and the terminal 7 of the storage battery 6 are as follows: They had the disadvantage of being heavy and large because they had to be thick and have a large contact surface to accommodate large current discharge. Furthermore, due to the structure of the 6 storage batteries and 5 vehicles, they are installed in a limited narrow space, and due to the structural strength of the insulator covering the terminals 7, there may be no peaks in the conductivity, or there may be a slight force. ), the problem is solved using the large clip 20. had.

The present invention solves the above-mentioned problems, and will be explained in detail below with reference to Examples. In Fig. 2, 1 is a vehicle, 2 is a starter which is a starting device for an internal combustion engine, 5 is a starting switch, 4 is a lighting circuit switch, 5 is a lighting circuit such as a stop lamp, 6 is a storage battery, and 7 is a terminal of the storage battery. , 8 & battery tester, 19' is a connection line, and 20' is the Ll input terminal. Figure 6 shows a circuit block diagram of the 0 battery tester 8, where 12 & is the terminal voltage of storage battery 6 and the terminal voltage for determination. 13 is a determination reference voltage generation circuit; 14 is a holding circuit that holds the comparison judgment result of the comparison circuit 12; 15 is a holding circuit that displays the judgment result held in the holding circuit 14; 16 is a reset circuit that resets the holding circuit 14; 17 is a changeover switch that specifies the type of rated voltage of the storage battery 6; and 18 is a changeover switch that specifies the type of starting method of the vehicle 1. .

Next, to explain the operation of the above configuration, when the input terminal 20 is brought into contact with the terminal 7, the storage battery voltage vb is inputted, the holding circuit 14 is reset by the reset circuit 16, and the voltage held in the holding circuit 14 is is cleared. When the starting switch 6 or the lighting circuit switch 4 of the vehicle 1 is turned on in this state, the storage battery 6 is discharged through the starter 2 or the stop lamp 5. The terminal voltage vb decreases with discharge, and if the voltage vb is less than a predetermined value of the capacity of the storage battery 6 or has reached the end of its life, the determination reference voltage v1 output from the determination reference voltage generation circuit 13 decreases. Therefore, a determination signal is outputted to the output of the comparison circuit 12, held in the holding circuit 14, and displayed on the output circuit 15 as a determination result of the discharge state or life of the storage battery B. In other words, in the reference voltage generation circuit 13, the storage battery voltage required to start the internal combustion engine of the car @1, the storage battery voltage that requires charging, and the discharge end voltage when discharging with a current corresponding to the lighting circuit current of a stop lamp, etc. The voltage determined by is set. The value is corrected according to the type of rated voltage of storage battery B and the type of starting method of single track 1, and the judgment reference voltage
It is output as γ. This makes it possible to appropriately determine the discharge state and lifespan of storage battery B.

Next, FIG. 4 shows temporal changes in terminal voltage when the storage battery is discharged for the conventional battery tester shown in FIG. 1 and the battery tester according to the present invention. A is the characteristic of the conventional battery tester, and b is the characteristic of the battery tester of the present invention.

In a conventional battery tester, when a storage battery is discharged, the voltage drops once at the beginning of discharge and then shows a constant voltage.However, in the battery tester of the present invention, when the starter 2 is started, decreased momentarily (several IDm5),
Although it has a characteristic of rising again, it is possible to compare the voltage Vy at the point when the terminal voltage has dropped the most with the determination reference voltage, and the life can be judged based on the degree of decrease in the terminal voltage.In addition, the terminal voltage of the storage battery When determining the voltage, the reference voltage used is the voltage that is safe when the internal combustion engine reaches the minimum starting speed (100 to 200 γpm), but in reality, the voltage that can be measured with a battery tester is the highest of the terminal voltages. Since the minimum starting speed has not been reached at the time of the drop and is not an appropriate value, based on the correlation between the terminal voltage at the minimum starting speed and the terminal voltage at the time of the lowest starting speed, The voltage required to start the internal combustion engine when the starting rotation speed is reached is converted to the voltage at which the terminal voltage of the storage battery has dropped the most, as detected by a battery tester, making it possible to make an appropriate determination.

As described above, the present invention is capable of determining the discharge state and lifespan of a storage battery installed in a vehicle by discharging the storage battery using electrical components included in the vehicle as a load, and by discharging the battery using electric components included in the vehicle as a load. Because it has a built-in high-power resistor, it does not need to be a component that can withstand large current discharge, it can be made smaller and lighter, and the connecting wires and connecting clips can be thinner and smaller, so it has a structure that cannot be measured conventionally. If the shape of the clip is made into a thin probe shape, it can be measured even if it is a thin probe (1) It has great industrial value.

[Brief explanation of the drawing]

Figure 1 shows the plug 11 of a conventional battery tester.
27 and 4 are terminal voltage characteristic diagrams. 1... Vehicle 1 6... Storage battery ＼ 8°... Battery tester, 12... Comparison circuit, 13...
... Judgment reference voltage generation circuit, 14... Holding circuit, 16... Reset circuit. Applicant: Yuasa Battery Co., Ltd.
Part 4 Collection α Spontaneous procedure amendment Supplement 1, Indication of the case 3, Person making the amendment 4 Relationship to the case Patent applicant postal code 569 Telephone Takatsuki (0726) 75-550
1 Address: QH-6, Kennishimachi, Takatsuki City, Osaka Prefecture 1 Correct Contents) The scope of the claims is amended as follows. [A battery tester configured with a circuit that compares the minimum storage battery voltage that is discharged to a load such as a vehicle starting and lighting circuit with a determination reference voltage set by the measured load and displays the determination result. ”Page 1, line 10 of the specification, ``Automobile''
is corrected to "automobiles and motorcycles". , on page 6 of the specification tube, line 14, change ``Voltage is cleared.'' to ``
The judgment result is cleared. ”. ) Specification II, Part 6, Part 19: Correct "below a predetermined value" to "capacity of storage battery B is less than a predetermined value". that's all

Claims (1)

[Claims] Consists of a circuit that holds the minimum storage battery voltage when discharging to a load such as an axle starting or lighting circuit, compares the storage battery voltage with a judgment reference voltage set by the measured load, and displays the judgment result. battery tester.